J.R.R. Tolkien, The Lord of the Rings, The Fellowship of the Ring, "Three is Company"
J.R.R. Tolkien, The Lord of the Rings, The Return of the King, "The Grey Havens"
J.R.R. Tolkien, The Lord of the Rings, Appendix B, "Later Events Concerning the Members of the Fellowship of the Ring"
J.R.R. Tolkien, Christopher Tolkien (ed.), Unfinished Tales, "The Palantíri", Note 2
J.R.R. Tolkien, The Lord of the Rings, Appendix B, "The Second Age"
J.R.R. Tolkien, Christopher Tolkien (ed.), The Peoples of Middle-earth
J.R.R. Tolkien, The Lord of the Rings, Appendix A, "The Númenorean Kings",
J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion